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结合珠蛋白是人体内存在三种表型的急性期蛋白;可结合游离血红蛋白,防止铁流失并避免氧化介导的组织损伤。
蛋白生物学功能
人结合珠蛋白 1‑1(Hp1‑1),是结合血红蛋白糖蛋白中功能最优的表型;通过 α1β 链相互缔合形成二聚体,可快速中和毒性游离血红蛋白(Hb),结合能力为每毫克 Hp 可结合 1.25‑1.5 mg 血红蛋白。其优异抗氧化能力来源于紧凑的多聚体结构,能够促进巨噬细胞通过 CD163 受体清除 Hp‑Hb 复合物;相比 Hp2‑1、Hp2‑2 表型,可更高效抑制铁介导的氧化应激以及 NF‑κB 炎症通路。
常见研究用途
临床研究表明:Hp1‑1 可保护内皮一氧化氮生物利用度、减少晚期糖基化终末产物生成,对糖尿病血管并发症具备保护作用;相较于其它表型,可将视网膜病变、肾病发生风险降低 50‑70%。在镰状细胞病急性发作期,携带 Hp1‑1 基因型人群游离血红蛋白水平降低 40%;因其对血红蛋白捕获能力增强,多器官衰竭风险下降一半。矛盾的是,肝硬化人群 Hp1‑1 占比升高(55%,健康人群为 30%),即便机体处于全身氧化应激状态,肝脏合成转向急性期蛋白表达模式。
常见研究方向:代谢研究、治疗药物研发、体外诊断(IVD)实验标准品、校准品与质控品、心血管研究、基于细胞的功能实验、质谱分析、氧化应激研究。
An acute phase protein with three phenotypes in the human population. Haptoglobin binds free hemoglobin preventing iron loss and oxidative tissue damage.
Role of protein in biology
Human haptoglobin 1-1 (Hp1-1), the most efficient phenotype of the hemoglobin-binding glycoprotein, forms dimers through α1β-chain associations, enabling rapid neutralization of toxic free hemoglobin (Hb) with a binding capacity of 1.25–1.5 mg Hb per mg Hp. Its superior antioxidant capacity stems from compact polymer structures that enhance CD163 receptor-mediated clearance of Hb-Hp complexes by macrophages, suppressing iron-driven oxidative stress and NF-κB inflammatory pathways more effectively than Hp2-1 or Hp2-2 phenotypes.
Common research uses
Clinically, Hp1-1 demonstrates protective effects against diabetic vascular complications by preserving endothelial nitric oxide bioavailability and reducing advanced glycation end-product formation, lowering retinopathy and nephropathy risks by 50–70% compared to other phenotypes. In sickle cell disease, Hp1-1 carriers exhibit 40% lower cell-free Hb levels during crises and a twofold reduction in multiorgan failure risk due to enhanced Hb sequestration. Paradoxically, Hp1-1 prevalence increases in cirrhosis (55% vs. 30% in healthy populations) as hepatic synthesis shifts toward acute-phase production despite systemic oxidative stress.
Common uses include metabolic studies, therapeutics research, IVD Assay standards, calibrators and controls,cardiovascular research, cell based assays, mass spectrometry, oxidative stress research.
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